Paper container.



W. L. WRIGHT.

PAPER CONTAINER.

APBLICATION FILED FEB. 2a. 1916.

Patented June 27, 1916.

WILBUR L. WRIGHT, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE PAPER VESSELS COMPANY, 0F BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND.

PAT?

NT orrio PAPER. CONTAINER.

To all whom t may concern:

Be it known that I, WILBUR L. WRIGHT, a citizen of the United States, and resident of Baltimore, State of Maryland, have invented certain new and useful Improvements in and Relating to Paper Contain- '-ers, of which the following is a specification.`

This invention relates to certain improvements in paper containers; and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanation of the accompanying 4drawings illustrating what I now believe to be the preferred mechanical expression or embodiment of my invention from among other forms and constructions within the spirit and scope thereof.

In the manufacture of so-called liquid tight paper containers it has henetofore been exceedingly difficult, if not impossible, to produce paper containers that would hold liquids for any reasonable length of time `without leakage and that were of such formation 'and construction as to be capable of economical manufacture to permit sale thereof at a low price. A

It is the object of my invention to pro.- duce .a `paper container of such construction and formation as to render the saine liquid tight and capable of holding liquids for reasonable lengths of time without leakage and which can be manufactured at low cost.

The invention consists in certain novel` before the crimping or spinning operation.

Fig. 3, is a longitudinal section. Fig. 4, is a detail section on an enlarged scale.,

The cylindrical paper body 1, of the container is usually formed by strips of paper spirally wound on a tube Winder and suitably secured, as will be readily understood by those skilled in the art, although my invention is not limited to spirally wound A Specification of Letters Patent. Patented J une 27,1916,

Application led February 28, 1916. Serial No. 80,870.

paper container bodies. This body is formed with an end closure consisting of a fiat inner sealing disk of relatively large diameter and an outer flanged cap or disk 3, formed with an annular flange 4, andl a peculiar crimped or spun end or bead form'- ing an end rim of the container and locking the flanged disk. in the container end to resist pressure in either direction longitudinally of the container body.

The diameter of the sealing disk 2, is greater than the diameter of the container body and said disk is paraflined or otherwise waterproofed before being inserted in the container body. In fact, the container body and the flanged disk or cap are preferably both paraifined or otherwise suitably waterproofed before the partsl are assembled. The inner sealing disk is preferably thorou hly waterproofed -throughout its periphera edge as vwell as its side faces the body. This cap 1s usually inserted in an edgewise or inclined position, because of its 4large diameter, and then so far as possible by hand, is pressed into -`approximately a horizontal position on -tlie upper end of the'mandrel. The flanged. cap or disk 3, isthen inserted in the upper `end of the body in an inverted position withl its flange projecting p upwardly Vand is pressed down on the inner sea-ling disk. and toward the mandrel end, see Fig. 2.' The body is sofarranged on the mandrel, that when the flanged disk is inserted and pressed down approximately into position for crimping, its flange will be approximately cylindrical and tightly fitting the inner surface of the bodyy end, 6, projecting upwardly an approximately predetermined distance beyond the edge of.k the flange. A suitable rotary crimping or f spinning and presser head is moved toward .the

body end and the disk therein to fold the body end 6, inwardly over the end edge yof the flange 4, of the outer disk or cap and then downwardly and tightly'wagainst with the body end 'ning head toward the end closures or disks 2, 3, is sufficient to tightly turn or double the outer end portion 7, of the flange 4, in-

` wardly and back toward the disk 3, and to buckle and crease said flange, and also to b-uckle the inturned portion 8, of the body end and crease the same radially and outwardly to interlock withthe flange 4, and fit behind the double end 7, thereof, and cooperate therewith in forming a lock. The spinning head is thus crushing or creasing the flange 4, and the body end 8, compresses said portion 8, against the outer face of disk 3, and at the same time said head compresses the inner and outer disks toward the mandrel end and flattens the same thereagainst and presses the adjoining faces of said disks so tightly together that they are caused toadhere particularly by reason of the waterproofing material thereon.

The action of the spinning head tends to tightly draw the outer portion of the body end 6, longitudinally and form the same with a smooth non-creased surface at the same time that the disks 2 and 3, are being flattened out against the mandrel end so that the peripheral edge of the enlarged inner disk 2, is approximately driven radially into the wall of the body to form a decided positive exterior annular enlargement, rib or bulge 9, and a corresponding inner groove or seat, while the radial or outward pressure on thel rounded annular edge of the mandrel and corner of the Harige cap 3, cause the peripheral edge l0, of the inner sealing disk to flare or flatten in the annular groove in the body wall to form and constitute a liquid tight joint between said disk and the body wall. The formation of this liquid tight joint is aided by the welding or adherence of the waterproofing material therein and thereon into and with the surface of the body wall and the waterproofing material therein and thereon. This joint can also be strengthened by application of paraffin or other waterproofing to the interior of the container after the completion of the end closure.

In the completed end closure, the inner sealing disk 2, is braced and strengthened to resist loosening or bulging under internal pressure, while the outer disk is braced against such lpressure by the peculiar lock formed by the longitudinally compressed and upset crimped flange and wall end. The inner sealing disk is protected against outward pressure by thebuter or flanged disk which is also braced against such pressure by the interlocking formation of the body wall end and disk flange. This end closure can as described and forming the container botv tom, although my invention is not so limited.

It is evident that various changes and modifications might-be resorted to without departing from the spirit and scope of my invention and hence l do not wish'to limit the invention tothe eXact disclosure hereof.

What I claim is 1. A paper material container having an end closure consisting of an inner sealing disk and an outer flanged disk arranged within the container body, the end of said body spun or crimped inwardly over the flange of said flanged disk to form a crimp locking said flanged disk in the body end, said disks being flat and parallel and held in engagement bracing each other against dishing and displacement. A

2. A paper container having a liquid tight end closure consisting of a large diameter inner sealing disk forced into the container body and forming 'an annular bulge in said body, the annular edge of said disk being seated and sealed in said bulge and a flanged outer disk in the container body and fitted against said sealing disk, the end of the body being tightly spun and crimped around and to the flange of said outer disk to fiXedly lock the same in position backing and brac-l ing said healing disk.

3. A paper container having a body, a flat inner sealing disk having its annular edge compressed into and tightly fitting in an annular outward bulge in said body, and a flat outer disk seated against and backing said inner disk and formed with an annular outwardly extending flange within the body, the end of the body being tightly crimped inwardly around said flange and in connection therewith forming a compressed locking bead. a

4. A paper container having a body formed with an annular internal depression, a relatively large diameter flat inner sealing disk spanning said body and having a flared annular edge seated in said depression and Aproviding a liquid tight joint between the disk and wall of the body, and a flanged outer disk spanningthe interior of thebody and fitting and stifl'ening said innery disk against loosening and dishing and having its 4flange and the end of the body united by a crimped bead to form a lock.

5. A paper container having its body pro-A vided with and spanned by a flat inner sealing disk having its annular edge pressed into and sealed to the surrounding Wall of the disk to form a liquid tight joint maintaining the disk against longitudinal movement in the body, said body being also provided With and spanned by a ianged outer sealing disk fitting said inner disk and united thereto by Waterprooiing material, the flange of said disk and the end Wall of the body being 10 tightly locked together by a permanent a liquid tight joint, and a flat outer cap.

pressed against said inner -cap and having an annular flange Within said body and permanently locked therein by a compressed crimped bead tightly itting the outer face of said outer disk and formed by the end Wall of the body and said Harige.

WILBUR L. WRIGHT. v 

